I watched that show religiously. I even taped it, but that was when we still had a beta-max recorder. I joined the fan club and still have the instruction manual, the club card, and the pencil that came with the set. The notebook had the cool secret city logo, but had really cheap brown paper. There was an eraser with the logo and three crummy markers too. Too bad he never did any other secret city books; the imagination station spawned a few books though.
I still have a bunch of secret city drawings that my friends and I drew together about 21 years ago.